摘要： 之前在 ASP.NET Core 2.0 中可以正常运行的代码，升级到 ASP.NET Core 2.1 之后出现错误："System.InvalidOperationException: No service for type 'Microsoft.AspNetCore.Mvc.ViewFeatures.ViewResultExecutor' has been registered"，查看 ViewResultExecutor 的定义发现 ViewResultExecutor 实现了 IActionResultExecutor 阅读全文